Scanned at 1000 documents per minute (!) at
200 dpi, 8 bit grayscale, grayscale deskewed in hardware,
JPEG compressed in real-time. These are not progressive
JPEGs, since they were compressed right in the scanner.
These images are about 25 Kbytes in size, compressed at a
compression ratio of around 22 to 1.
Courtesy DC Public Library (they use them for scratch
paper).